Some of the students have already learned enough English to ____ a conversation with a native English speaker.
| A．hold on | B．keep on | C．go on | D．carry on |
He didn't answer, with his gun __________ at David.
| A．aims | B．to aim |
| C．aiming | D．being aimed |
Teachers are now aware of the difficulty that some students have __________ attention.
| A．paid | B．to pay | C．paying | D．pay |
—I made it at last. I am on top of the world!
— __________
| A．Congratulations. | B．Don't fall down! |
| C．Oh, really? | D．So far, so good. |
Liu Xiang trained hard before the Asian Games in Guangzhou, and it __________. He won the gold medal in 110 meters' hurdles.
| A．worked out | B．paid off |
| C．marked out | D．got through |
I can't __________ to lose the papers because they contain a lot of confidential information.
| A．afford | B．offer |
| C．allow | D．admit |